Gerry Atrick wrote:
On my bathtub the faucet stem screw that holds the handle on, is
stripped. This cartridge stem does not appear to be easily
available,
in fact no one has been able to determine the manufacturer of the
faucet and it is not labelled.

1st, ask at your local hardware if they have faucet repair stems. If
they do, take yours out and let them patch it. If that doesn't work,
while at the hardware pick up a tube of "J.B. Weld" Clean and dry the
stripped out hole, mix the J.B. Weld and put in the hole and assemble
the parts, just snug the screw. Let set 24 hours or more before using.
J.B.Weld needs to be in everyone's tool kit.